The Aero Precision ATLAS S-ONE is a complete rifle featuring Aero's S-ONE handguard, an ultra-slim single-lug design that provides the smallest possible diameter while maintaining M-LOK compatibility, resulting in one of the lightest factory AR-15s available. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2019, USA Weight: 58 oz Overall length: 32.5" Status: Active Intended use: Hunting, Tactical